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KTX-1 복합재 브레이크 페달 개발 및 구조 인증시험
조치룡,김현수,김광수,Joe, Chee-Ryong,Kim, Hyun-Su,Kim, Kwang-Su 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
A brake pedal for the flight control system of the Korean primary trainer is developed using composite material. The development includes the structural design, stress analysis, manufacturing and the qualification tests. A FEM analysis is used for the structural design and stress analysis. Autoclaving process is used to fabricate the composite brake pedal. For the qualification tests, modular fixtures are developed and applied. It is shown that the composite brake pedal developed meets all the structural integrity requirements specified in the military specification for aircraft parts.
조치룡 國立 昌原大學校 産業技術硏究所 1993 産技硏論文集 Vol.7 No.-
Linear short fibers are added between laminae in a composite laminate to improve the interlaminar fracture toughness. The interlaminar fracture resistance is determined in terms of fracture energy utilizing the generalized locus method which can evaluate the fracture energy even in highly non-linear materials. The fracture energy of the short fiber reinforced specimens is increased about 20%. From the fracture surface study, it is show that the short fibers added at the interface disturb the progress of the fiber branching between the laminae during the fracture. This interruption behavior of the short fiber is thought to be the main cause of the improvement of the fracture energy.
복합재료 부품 표면에 다양한 딤플을 형성하는 성형 방법
조치룡 ( C R Joe ),변길재 ( Gill Jae Byun ) 한국복합재료학회 2013 Composites research Vol.26 No.1
본 연구에서는 공기역학적 또는 열 전달에 유리한 형상인 딤플을 복합재료 제품의 표면에 다수 형성하는 경제적이고도 효과적인 성형방법을 개발하였다. 금형을 이용하여 제품의 표면에 다수의 딤플을 형성시키려면 몰드의 표면에 볼록한 반구형상을 가공하여야 하는데 이렇게 하려면 높은 금형 제작비가 소요된다. 본 연구에서는 다수의 원형 구멍이 뚫린 판재를 이용하여, 이의 표면에 복합재료 스킨을 입히면서 외부에서 압력을 가하여 딤플 형상이 표면에 자연스럽게 형성되도록 하는 방법을 개발하였다. 표면에 다수의 딤플을 갖는 복합재료는 공기저항을 줄이거나 방열효과가 필요한 고속 경기용 자동차의 외장 등으로 널리 응용 될 수 있을 것으로 사료된다. In this study, an economical and effective processing technique to form multiple dimples on the surface of a composite part, which are known to be useful to improve aerodynamic performance and heat dissipation. Forming dimples on the surface using molds is an expensive processing because forming multiple tiny positive spheres on the surface of the mold requires much time and effort. In this study, plates with multiple round holes are utilized as a core to form dimples on the carbon/epoxy composite skin covering the core. A vacuum bagging process is used to apply pressure on the surface while curing. Composite parts which have multiple dimples on the surface can be utilized in the field which needs high aerodynamic performance and heat dissipation ability such as high speed sports car bodies.